Cold optical design for the Large Aperture Simons Observatory telescope
astro-ph.IM
/ Authors
S. R. Dicker, P. A. Gallardo, J. E Gudmundsson, P. D. Mauskopf, A. Ali, P. C. Ashton, G. Coppi, M. J. Devlin, N. Galitzki, S. P. Ho
and 19 more authors
C. A. Hill, J. Hubmayr, B. Keating, A. T. Lee, M. Limon, F. Matsuda, J. McMahon, M. D. Niemack, J. L. Orlowski-Scherer, L. Piccirillo, M. Salatino, S. M. Simon, S. T. Staggs, R. Thornton, J. N. Ullom, E. M. Vavagiakis, E. J. Wollack, Z. Xu, N. Zhu
/ Abstract
The Simons Observatory will consist of a single large (6 m diameter) telescope and a number of smaller (0.5 m diameter) refracting telescopes designed to measure the polarization of the Cosmic Microwave Background to unprecedented accuracy. The large aperture telescope is the same design as the CCAT-prime telescope, a modified Crossed Dragone design with a field-of-view of over 7.8 degrees diameter at 90 GHz. This paper presents an overview of the cold reimaging optics for this telescope and what drove our choice of 350-400 mm diameter silicon lenses in a 2.4 m cryostat over other possibilities. We will also consider the future expandability of this design to CMB Stage-4 and beyond.